What’s new in the upcoming PHP 7.4?

One thing I personally find missing in PHP’s typehinting, is a way to typehint array contents — e.g. “I’d like an array of Foo‘s”.

The addition of a [] suffix on the hinted type – like Java has – could potentially solve this. In the mean time you can resort to hackery like this (src):

// Definition
class ArrayOfFoo extends \ArrayObject {
    public function offsetSet($key, $val) {
        if ($val instanceof Foo) {
            return parent::offsetSet($key, $val);
        }
        throw new \InvalidArgumentException('Value must be a Foo');
    }
}

// Usage
function workWithFoo(ArrayOfFoo $foos) {
    foreach ($foos as $foo) {
        // etc.
    }
}

I anyone has a better way to tackle this, feel free to enlighten me by leaving a comment.